Mixed gliomas

One hundred and two cases of central nervous system glial neoplasms composed of varying mixtures of oligodendroglioma, astrocytoma, and ependymoma were reviewed. The tumors were divided into Grades I and II, and into “compact” types where representative tumor types were located in separate areas, and “diffuse” types where representative tumor cells were intermingled. Prognosis for Grade I was good, and commensurate with published survival statistics for Grade I astrocytoma and oligodendroglioma. Survival time for Grade II was close to published survival statistics for Grade II astrocytoma. Survival rates could not be related to other parameters. Sixteen cases progressed to glioblastoma multiforme.